<!DOCTYPE html>
<html lang="en">
	<head>
		<meta charset="UTF-8" />
		<meta http-equiv="X-UA-Compatible" content="IE=edge" />
		<meta name="viewport" content="width=device-width, initial-scale=1.0" />
		<title>回顾一个DOM操作</title>
	</head>
	<body>
		<button id="btn">点我传建一个输入框</button>
		<script>
			const btn = document.getElementById('btn')
			btn.onclick = function () {
				const input = document.createElement('input')
				input.className = 'demo'
				input.value = 99
				input.onclick = () => alert(1)
				document.body.appendChild(input)

				input.focus()

				input.parentElement.style.backgroundColor = 'skyblue'
				console.log(input.parentElement)
			}
		</script>
	</body>
</html>
